The Second Empress by Michelle Moran
Empress Josephine's family has been called to Napoleon's court for the terrible news that he intends to divorce his wife of thirteen years, who has failed to provide an heir, and take a younger bride, the Austrian Princess Marie-Louise. For his new wife, it is a horrible duty she must take on in her father's name. Marie-Louise must leave her love and family behind for an older man with whom she has nothing in common. There is little in her new life to enjoy. But an unlikely friendship with Hortense, Josephine's daughter, will bring her comfort, as she struggles to find happiness. For Napoleon's sister, Pauline Bonaparte, it is yet another woman stealing her brother's attention. She's spent years attempting to control his power and this latest distraction is the biggest threat she's ever faced. It's time to fight.